CVE-2026-89677

Last refreshed2026-10-19

Status: UPDATED | Advisory ID: CVE-2026-89677

Key Details

CVE	CVE-2026-89677
CVSS Score / Version	9.8 (Critical) / CVSS v3.1
Updated	2026-10-19
CVSS Vector	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
CVSS Prose	attack vector is network; attack complexity is low; privileges required is none; user interaction is none; scope is unchanged; confidentiality impact is high; integrity impact is high; availability impact is high.
Affected products	Linux Kernel

Vendor	Product	Affected Versions	Patch Status
Linux	Linux Kernel

Vendor

Product

Affected Versions

Patch Status

Linux

Linux Kernel

Subsystems	OT Supporting Infrastructure
Sectors	All Sectors

In the Linux kernel, the following vulnerability has been resolved:

nfsd: fix possible fh_compose of wrong dentry in nfsd4_create_file()

dentry_create() can hypothetically provide a different dentry than the

one passed in. This could happen, for example, if the exported

filesystem is NFS, and the server returned to OPEN a filehandle which

matched a directory that was already in the dcache. Clearly this would

not be expected!

If this were to happen the dentry (child) that was already stored in

resfhp could be freed and later dereferenced.

We shouldn't call fh_compose() until we are certain that we have the

final dentry, so this patch moved the fh_compose() call to two places:

one for the case where the target already exists, and one after

dentry_create() where it was created. (NVD)

Monitor Linux's web page for any future patch releases.

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-89677
CVE	https://www.cve.org/CVERecord?id=CVE-2026-89677

Source

Reference

NVD

CVE